Earth-auger.



No. 648,|55. Patented Apr. 24, i900. J. G. & S. S. SHERMAN. EARTH Auen.

(Appn t mdFb 1s 1899) (No Model.)

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UNITED STATES PATENT OFFICE,

JEREMIAH G. SHERMAN AND SAMUEL S. SI-IERMAN,OF VEST MOHENRY,

. ILLINOIS.

EARTH-AUGER.

SPECIFICATION forming part of Letters Patent N o. 648,155, dated April24, 1900.y

` Application filed February 18, 1899. Serial No. 706'0Z8 (N0 IDOBL) .Toal?, whom, it may concern: Be it known that we, JEREMIAH G. SHER- MANand SAMUEL S. SHERMAN, citizens of the United States, and residents ofWest Mc- Henry, in the county of McHenry and State of Illinois, haveinvented certain new and useful Improvements in Earth-Angers; and we dodeclare the following to be a full,clear, and exact description of theinvention, ksuch to as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

Figures 1 and 2 ofthe drawings are side elevations of the invention indifferent positions,shank-D being broken away.` Iiig. Sisa section online 4,4, Fig. 2, looking upwardly.

This invention is designed as an improvezo ment upon the earth-augerdescribed and claimed in our Patent No.V 295,444, dated March 18, 1884:,and has for its object to provide the auger with an improved point belowits cutting-bit adapted lto steady and centerv the auger and enable itto-cut a hole larger than the diameter of its blade. Considerabledifficulty has been experienced heretofore in providing augers of thisclass with a point sufficiently large to steady and center the 3o augerin soft ground which would force its way easily through dry hardground.j This ldifficulty we propose to overcome by our invention, whichconsists in a point of the peculiar construction and arrangementhereinafter described, and pointed out in the appended claim.

Referring to the accompanying drawings,

side of the said point is a steel cutter-blade C, whose concave cuttingportion extends partially over the flat face of the point from 5o theside thereof nearest the inner extremity of the bit of the auger-blade,the outer surface of said cutter forming a vcontinuation of the conicalsurface of the point. We have usually made this point about four andonehalf inches long; but it may be made of any suitablev length. Thecutter C, which projects from the edge of the iiat side of the pointadjacent to -the bit, is set to cut in the saine direction as the bitand follows-behind the bit. Y This cutter is of grad ually-increasingwidth from bottom to top. (See Fig. l.)

The point, together with the stem or shank D, is eccentric with respectto the augerauger in place in soft ground, owing to its iiat sidebeingplaced against the pressure ofthe earth in cutting therethrough,and cuts its way through hard ground, where it would be impossible toforce a round or conical point of sufficient size to hold the auger inplace in soft ground.

Although especially designed for use in connection with the auger shown,a similar point may be used to' advantage upon other augers.:

we claim as new, and desire to secure-by Letters Patent, isi Thecombination with an earth-auger, having the spiral flange and bit uponthe shank thereof, of a centering and steadying point of the form of anelongated semicone, the flat side of which faces the cutting pressure ofsaid bit, and a cutting-flange of graduallyincreasing width from bottomto top projecting from the edge of said flat sidenearest the innerextremity of said bit, the outer surface of said cutting-flange forminga continuation of the conical surface of the point, substantially asspecified.

In testimony whereof we affix our signa? tures in presence of twowitnesses.

JEREMIAH G; SHERMAN.

SAMUEL S. SHERMAN.

Witnesses:

JOHN W. KIMBALL, H. C. MEAD.

Having thus described ourinvention, whatA blade, so that the latter`will cut a hole of a 6.5

